They'll work. However....
When it comes to any electronic
device a little knowledge will make your life much easier. Cartos and attys have a ohm rating to help you dial in your
vaping experience. The higher the number the more voltage you can add. For an ego I like the stuff that comes in the 1.5 to 2.0 range. This will give you more vapor, a warmer feeling, and a much better throat hit. Using 3.0 on an ego will work, but you'll have to hold down your button longer and take a much slower drag to get the same results. My wife on the other hand uses stuff in the 2.4 to 2.8 range because that's what she likes. I only use 3+ ohm stuff on my 6v mod. It will all come down to preference. I would suggest you order some 2.0 cartos which you can get a 5 pack of for around 8 bucks or so and compare the two. If neither one is "perfect" try something else. You'll find what you like soon enough. Unfortunately there is no universal vape that everyone can agree on. You'll just have to try it untill you find your sweet spot.